ci: build and check on Windows, Linux and macOS

Windows and Ubuntu 22.04 run fmt, clippy, tests, lint, the JS tests and
a no-bundle release build. The Windows row checks the exe version
resource and uploads the exe as a 7-day artifact. macOS runs cargo check
as the compile gate.

.github/workflows/ci.yml

@@ -0,0 +1,90 @@
+name: CI
+
+on:
+  push:
+    branches: [main, feat/tauri-port]
+  pull_request:
+
+permissions:
+  contents: read
+
+concurrency:
+  group: ci-${{ github.ref }}
+  cancel-in-progress: true
+
+jobs:
+  build:
+    name: ${{ matrix.os }}
+    strategy:
+      fail-fast: false
+      matrix:
+        os: [windows-latest, ubuntu-22.04]
+    runs-on: ${{ matrix.os }}
+    steps:
+      - uses: actions/checkout@v7
+
+      - uses: dtolnay/rust-toolchain@stable
+        with:
+          components: clippy, rustfmt
+
+      - uses: Swatinem/rust-cache@v2
+
+      - uses: actions/setup-node@v7
+        with:
+          node-version: lts/*
+          cache: npm
+
+      - name: Install Linux build prerequisites
+        if: runner.os == 'Linux'
+        run: |
+          sudo apt-get update
+          sudo apt-get install -y libwebkit2gtk-4.1-dev build-essential curl wget file \
+            libxdo-dev libssl-dev libayatana-appindicator3-dev librsvg2-dev
+
+      - run: npm ci
+
+      - run: cargo fmt --check
+
+      - run: cargo clippy --all-targets --locked -- -D warnings
+
+      - run: cargo test --locked
+
+      - run: npm run lint
+
+      - run: npm test
+
+      - run: npm run tauri build -- --no-bundle
+
+      - name: Check the exe version resource
+        if: runner.os == 'Windows'
+        shell: pwsh
+        run: |
+          $match = Select-String -Path Cargo.toml -Pattern '^version\s*=\s*"([^"]+)"' | Select-Object -First 1
+          $cargoVersion = $match.Matches.Groups[1].Value
+          $info = (Get-Item target/release/claude-code-usage-bubble.exe).VersionInfo
+          $info | Format-List ProductName, CompanyName, FileDescription, FileVersion, ProductVersion, LegalCopyright
+          if ($info.ProductVersion -ne $cargoVersion) {
+            Write-Error "ProductVersion '$($info.ProductVersion)' does not match Cargo.toml version '$cargoVersion'"
+            exit 1
+          }
+
+      - name: Upload the Windows exe
+        if: runner.os == 'Windows'
+        uses: actions/upload-artifact@v7
+        with:
+          name: bubble-exe-${{ github.sha }}
+          path: target/release/claude-code-usage-bubble.exe
+          retention-days: 7
+          if-no-files-found: error
+
+  macos-check:
+    name: macos-latest (cargo check)
+    runs-on: macos-latest
+    steps:
+      - uses: actions/checkout@v7
+
+      - uses: dtolnay/rust-toolchain@stable
+
+      - uses: Swatinem/rust-cache@v2
+
+      - run: cargo check --all-targets --locked